Call us today: 0844 573 1818 Calls cost 7p per minute plus your phone company's access charge

100% Satisfaction Guarantee

Track Your Order

Award Winning Varieties

Voted Best Online Retailer

Our Customers Rate Our Excellent Service

Home


Special Offers

5 petunia plants only £2.99 with every order

Snips only £1.99 with every order

5 fuchsia plants only £3.99 with orders over £25

Dahlia 'XXXL Collection'

0 Options from £12.99

Half-Hardy Annual
What is Half-Hardy Annual?
A plant that completes its entire life cycle (growth, reproduction, death) in one season.
Can be grown outdoors but requires winter protection from frosts and temperatures below 0C.

The biggest and best patio dahlia

Very sturdy dahlias; no staking required

We are really sorry, but this product is no longer available.

Please note: This product cannot be delivered outside the United Kingdom.
Description How to Grow More Info Delivery Video
  • The biggest and best patio dahlia
  • Very sturdy dahlias; no staking required
Twelve years of breeding have produced this extra strong, extra sturdy Dahlia, with extra large blooms up to 30cm (12") accross. Fantastic in borders or large patio pots, Dahlia 'XXXL' is so vigorous that you can even plant our young plants directly into their final containers. The enormous blooms don't just put in a quick appearance at the end of the summer, they flower right through the season. Height: 120cm (48"). Spread: 60cm (24").

Culinary note: All dahlia flowers and tubers are edible. The flavours and textures can vary greatly depending on the soil and conditions in which they were grown. Flavours range from water chestnut through to a spicy apple or even carrot. For more details about edible flowers click here.


Patio, Cottage Gardens, Exotic Garden, Cut Flower Garden

Half-hardy

Full sun

Up to 120cm (47.2in)

Up to 60cm (23.6in)

Easy for all

Easy for all

Thompson & Morgan strives to ensure that all its plants are delivered to you in the perfect condition for planting. Sadly, the time it takes to deliver to certain locations in the UK means that we can't guarantee this, so regretfully we are unable to ship live plants to the following areas: GY, HS, IV41-IV49, IV51, IV55-56, KW15-KW17, PA34, PA41-48, PA60-PA78, PA80, PH40-PH44, TR21-TR24, ZE1-ZE3.

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
JUNJULAUGSEP
Flowering Months
Feed and water dahlias regularly throughout the growing season. While plants are still young, pinch out the growing tip of each stem to encourage bushier growth and masses of flowers. As dahlias develop, the taller varieties will require staking with garden canes to support their stems. Deadhead faded dahlia flowers to encourage more blooms to be produced. With the first autumn frosts, remove tubers from their growing positions and trim away the old stems to 5cm above the tuber. Clean any remaining soil from the tubers and store them over winter in trays of peat or sand, in a cool but frost free position. The tubers can be planted the following spring for another fabulous display.
Pot up dahlia plants and grow them on in warm, frost free conditions until they are well grown. When all risk of frost has passed, gradually acclimatise dahlia plants to outdoor conditions over 7 to 10 days before planting out in beds, borders and containers. Choose a position in full sun on any rich fertile, moist, well drained soil.

Delivery

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £1.95.

Orders which include any other products will incur a delivery charge of £4.95.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.90 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details and details of any surcharges that may apply to certain destinations.

Satisfaction Guaranteed

For your complete peace of mind, our Home and Garden products may be returned to us within 30 days of purchase for a refund of the purchase price. Items must be returned unused, at your cost and in mint condition. All items carry a manufacturer's 12 month defects warranty.